Improvement in school-desks



tion of the same, reference being had to the the backs of seats whichare pivoted to their back, and connecting devices, whereby said UNIT DSTAT "f1 y- VVILLIAM PIUIILINGER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT lN Specification forming part of Letters Patent No. 151,177,dated May 1 January 24, 1874.

aunexed drawings, making a part of this specification, and to theletters and figures of reference marked thereon.

Figure 1 of the drawing is a representa tion of a side view of myschool-desk. Fig. 2 is a sectional view of the same. Figs. 3, 4, 5, and6 are detail views of the same.

This invention relates to novel improvements on school-desks, the backsof which serve as frames. It consists in the construction and novelarrangement of the desk frame, seat,

seat and back can each be made in one continuous piece, bent to conformto the natural shape of the body, and properly strained between the sideframes. The invention, finally, consists in the application'of a rubberstop of peculiar form to the pivoted seat-arms, for the purpose ofrendering the same noiseless while raising or lowering the seat.

The following is a description of my improvements:

In the annexed drawings, A A designate the two side frames of the desk,which are made of cast metal, and constructed with standards A, to whichthe seat-arms 'G are pivoted. B designates the top of the desk, which issecured on the frames Aby means of screws passed upward through flangesa. O is the seat-back, which is made of one piece of wood, which issteamed and bent so as to present a convex upper surface and a concavelower surface, which latter terminates at the back edge of the seat D.The seat D, which is also made of wood, is steamed and bent so as topresent a convex front surface and a concave back surface.

I thus have a solid seat and a solid back SCHOOb-DESKS.

9, 1874; application filed therefor, which have the same contour as thehuman body in a sittingposition.

The ends of the back 0 are fitted into grooves which are formed into theback portions of the seat-frame, which grooves correspond in their shapeto the shape which it is desired to have the back. The seat-board D isalso fitted into grooves '6, formed into the seat-arms G G, whichgrooves correspond to .the shape it is desired to have the seatmaintain.

For the purpose of supporting the back board and the seat-board in theirproper positions, I have inserted strap-nuts J, (shown clearly by Figs.3 and 4.) Each strap-nut J consists of a nut, j, and a concentric hook,j, formed on a narrow strap. The hook j is received into a recess, whichis bored into the wood; and the nut j, which is on the oppo site side ofthe strap to the hook j, receives a screw, 0, which is passed through alug, b, on frame A, or through a lug, c, on the seat-arm G. The hook jtakes a firm hold in its recess (1, and when screw cis tightly set upthe parts are firmly held.

In the drawings I have represented two of the above-described fasteningsat each end of the seat and back boards but, in practice, a greaternumber of the fastenings may be employed.

On one end of each arm G, and on its inner side, I form two obtuseangular flanges, 9 be tween which is a tube, g and into the recess thusmade Iinsert a centrally-perforated block, g, of indiarubber. (Shownclearly in Fig. 5.) By means of a covering-plate, 72, and a screw, h, Iconfine the rubber block in its recess. The ends of the block 9 areexposed, so that when the seat is down, as shown in Fig. 1, one end ofthis block abuts against a stop or lug,

p,- and when the seat is up the other end of the block abuts against astop or lug, p.

I thus prevent noise when the seat is thrown up or down and, by makingthe blocks 9 of a diamond shape,truncated, an d confining them to theirarms G, as described,these blocks will not slip out of their placesunder any circumstances.

rrron.

I am aware that seats and backs of schooldesks have been made of narrowslats fitted into grooves made in their respective frames, and confinedby means oftie-bolts, and I make no claim to such a contrivance.

What I claim as new, and desire to secure by Letters Patent, is-- 1. Thecombination, with the grooved side frames of a school-desk, of the shortstrainingstraps J, having bearings j, and the seat D or back 0,substantially as specified.

2. ,The reversible diamond-shaped centrallyperforated rubber stop-blockg, having a bearing at each end, in combination with angular sideflanges 9 stops 1) p, and a centrally-arranged tubular lug, 9substantially as specified;

In testimony thatI claim the above I have hereunto subscribed my name inthe presence of two Witnesses.

WVILLIAM P. UHLINGER.

Witnesses:

O. F. MILLER, 11. L BAonoFuER.

